Defer construction of the zipfile.Path and release the handle after grabbing a temporary file. Closes python#110.

Author: jaraco

importlib_resources/_common.py

@@ -108,7 +108,11 @@ def as_file(path):
     Given a Traversable object, return that object as a
     path on the local file system in a context manager.
     """
-    with _tempfile(path.read_bytes, suffix=path.name) as local:
+    reader = path.read_bytes
+    with _tempfile(reader, suffix=path.name) as local:
+        # release the handle to the path and reader
+        del reader
+        del path
         yield local
 
 

importlib_resources/readers.py

@@ -22,8 +22,8 @@ def files(self):
 class ZipReader(abc.TraversableResources):
     def __init__(self, loader, module):
         _, _, name = module.rpartition('.')
-        prefix = loader.prefix.replace('\\', '/') + name + '/'
-        self.path = ZipPath(loader.archive, prefix)
+        self.prefix = loader.prefix.replace('\\', '/') + name + '/'
+        self.archive = loader.archive
 
     def open_resource(self, resource):
         try:
@@ -38,4 +38,4 @@ def is_resource(self, path):
         return target.is_file() and target.exists()
 
     def files(self):
-        return self.path
+        return ZipPath(self.archive, self.prefix)